A biomarker is defined as a measurable indicator of a biological state or condition. Biomarkers can be found in a person's blood, urine, tissue, or other bodily fluids. They can be used to identify diseases, monitor disease progression, predict treatment response, and evaluate the effectiveness of therapies.

In the healthcare industry, biomarkers are an important tool for identifying and diagnosing diseases. For example, a biomarker may be used to identify cancer cells in a patient's blood or urine sample. Biomarkers can also help doctors track the progression of a disease. For example, a biomarker may be used to monitor the levels of cholesterol in a patient's blood over time.

Biomarkers are also used to develop and test new drugs. By studying biomarkers in patients, researchers can determine whether a drug is effective and safe. For example, a biomarker may be used to identify which patients will respond best to a particular drug.

Overall, biomarkers are an important tool in the healthcare industry for identifying diseases, tracking disease progression, and developing and testing new drugs.